Apple has made quite a noise about its brand new chip, the M7 motion coprocessor designed to offload taking sensor measurements from the iPhone 5s's main A7 processor. Because the M7 requires at least one-sixth of the power versus the 64-bit A7 chip, it can log data from the accelerometer, gyroscope and compass sensors independently of the A7 package, thus allowing for substantial power savings.
The details of how this data is captured and what power savings developers can count on were kept to Apple's chest until the Argus app made headlines as the first fitness software optimized for the M7 silicon. Here are a few previously unknown details about Apple's motion coprocessor hardware...